Try to avoid if statement

anti-if.js

var response = 4;


var api = {

  dispatch: function(status){

    var states = {
      1: api.__err,
      2: api.__err,
      4: api.__done
    }

    typeof states[status] !== 'undefined' ? states[status]() : api.__err()
  }.bind(this),

  __err: function(){
    console.log ('err')
  },

  __done: function(){
    console.log ('done')
  }
}


api.dispatch(response)